Updated `DigitalData.Auth.API.csproj` to include new package references for improved security and functionality. Added a `Verify` method in the `Backdoor` class to securely check user credentials against plain text and hashed passwords. Introduced `BackdoorExtensions` with methods for easier retrieval of `Backdoor` instances by username.
This commit refactors the namespace from `DigitalData.Auth.API.Dto` to `DigitalData.Auth.API.Models` in several files, improving the organization of data structures. A new `Backdoor` class is added to support backdoor authentication, along with a method in `DependencyInjection.cs` to register backdoor configurations. Additionally, `AuthApiParams` configuration is included in `Program.cs`, and a new JSON structure for backdoor users is introduced in `backdoors.json`. These changes enhance the codebase's structure and functionality.
